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Aufsatz
Electron Beam Welding of Hot-Rolled Fe–Mn–Al–Ni Shape Memory Alloy Sheets
(2023-04-25)
The present study focuses on the weldability of hot-rolled Fe–Mn–Al–Ni shape memory alloy sheets by vacuum electron beam welding. Tailored process-specific welding parameters, such as preheating with electron beam or beam oscillation during welding, allowed defect-free joining with very thin weld seams and heat-affected zones. By applying a post-weld cyclic heat treatment, abnormal grain growth can be promoted across the weld seams. However, regardless of the selected welding parameters, some specimens are characterized ...
Aufsatz
Low-Cycle-Fatigue Performance of Stress-Aged EN AW-7075 Alloy
(2023-05-05)
The effect of a novel heat treatment, that is, aging under superimposed external stress, on the fatigue performance and microstructural evolution of a high-strength aluminum alloy (EN AW-7075) is presented. Stress aging, a combination of heat treatment and superimposed external stress, can enhance the mechanical properties of EN AW-7075 under monotonic loading due to the acceleration of precipitation kinetics. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) reveal that a longer ...
Aufsatz
On the Reliability of Automated Analysis of Fracture Surfaces Using a Novel Computer Vision-Based Tool
(2023-08-05)
Fracture surface analysis is of utmost importance with respect to structural integrity of metallic materials. This especially holds true for additively manufactured materials. Despite an increasing trend of automatization of testing methods, the analysis and classification of fatigue fracture surface images is commonly done manually by experts. Although this leads to correct results in most cases, it has several disadvantages, e.g., the need of a huge knowledge base to interpret images correctly. In present work, an ...
Aufsatz
Cyclic Superelastic Behavior of Iron-Based Fe-Ni-Co-Al-Ti-Nb Shape Memory Alloy
(2023-01-03)
Iron-based shape memory alloys came into focus as promising candidate materials for large-scale structural applications owing to their cost-efficiency. In the present work, the superelastic properties of a recently introduced Fe-Ni-Co-Al-Ti-Nb shape memory alloy are investigated. For 〈001〉-oriented single-crystalline material in aged condition (650 °C/6 h), an incremental strain test reveals excellent superelasticity at −130 °C with fully reversible strains up to about 6%. Under cycling loading at different test ...
Aufsatz
Electrochemical polarization behavior and superelastic properties of a Fe–Mn–Al–Ni–Cr shape memory alloy
(2022-10-22)
The present study investigates the corrosion behavior of a Fe–Mn–Al–Ni–Cr shape memory alloy in a 5.0 wt% NaCl solution in combination with the functional properties. In a single crystalline condition, the investigated alloy shows a superior superelastic response with a maximum recovery strain of 5.2%. Furthermore, the results of the potentiodynamic polarization and impedance spectroscopy show that the addition of chromium generally improves corrosion resistance by increasing the resistance to localized corrosion. ...
Teil eines Buches
Von der Reise zur Karte und zurück
(De Gruyter, 2021)
This essay concentrates on the creative potential of mapping for the subsequent processing of travels, experiences, and descriptions as well as on the associated cultural techniques, such as copying, imitating, quoting, de-contextualizing, re-contextualizing, and transplantation. It focuses on the transformation from travel to map and from the map back to the space traveled. Based on examples in which travel knowledge and cartographic skills are intertwined, the essay illuminates the wide spectrum of possibilities ...
Rezension
[Rezension zu:] David Juste, Benno van Dalen, Dag Nikolaus Hasse u. Charles Burnett (Hgg.), Ptolemy’s Science of the Stars in the Middle Ages (Ptolemaeus Arabus et Latinus-Studies 1). Turnhout, Brepols 2020. X, 463 S. 11 s/w-Abb. 24 Tab.
(2023-12-14)
Rezension von Ingrid Baumgärtner zu: David Juste, Benno van Dalen, Dag Nikolaus Hasse u. Charles Burnett (Hgg.), Ptolemy’s Science of the Stars in the Middle Ages (Ptolemaeus Arabus et Latinus-Studies 1). Turnhout, Brepols 2020. X, 463 S. 11 s/w-Abb. 24 Tab.
Beitrag zu Periodikum
Europe’s authoritarian shift
(2023)
The European Union prides itself for being a legal order and a supranational organisation created through, and organised around, a specific institutional framework and an ordoliberal-inspired “rules against discretion” approach. Theories of ‘integration through law’ abound and the European Monetary Union (EMU) remains a unique common currency area structured within a constitutional framework. Officially, the formal priority of treaties, mandates and the European legal framework are presented as the sine qua non of ...
Dissertation
Multifinalität von Verlust- und Trennungserfahrungen in der frühen Adoleszenz
(2022)
Zahlreiche Erkenntnisse aus den bisherigen Untersuchungen zu den langfristigen Auswirkungen einer Scheidung auf die Kinder konvergieren in der Einsicht, dass eine elterliche Trennung mit negativen psychosozialen Folgen einhergehen kann, dies jedoch nicht zwangsläufig muss. Ein einheitliches Muster von Scheidungsfolgen konnte bisher nicht gefunden werden. So zeigten bisherige Studien, dass die individuellen Trennungsverläufe und die damit einhergehenden Stressoren aber auch Ressourcen der Kinder und Familien die ...
Video
LAMBAYEQUE – TERRITORIO Y CLIMA
(2023-04-28)
La amplia planicie aluvial costera de Lambayeque históricamente ofrece buenas condiciones para la explotación agrícola, permitiendo el florecimiento de las culturas que allí se asentaron – muy a pesar de las lluvias del Fenómeno del Niño, que cíclicamente devastan la infraestructura de riego, vial, de producción y habitacional.
La conferencia presenta las estrategias de ocupación del territorio desarrolladas por cada época para enfrentar las destrucciones por lluvia e inundación.
Alberto Risco Vega
- Arquitecto ...